1 /* This file is tc-avr.h 2 Copyright (C) 1999-2016 Free Software Foundation, Inc. 3 4 Contributed by Denis Chertykov <denisc (at) overta.ru> 5 6 This file is part of GAS, the GNU Assembler. 7 8 GAS is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3, or (at your option) 11 any later version. 12 13 GAS is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GAS; see the file COPYING. If not, write to the Free 20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 21 02110-1301, USA. */ 22 23 /* By convention, you should define this macro in the `.h' file. For 24 example, `tc-m68k.h' defines `TC_M68K'. You might have to use this 25 if it is necessary to add CPU specific code to the object format 26 file. */ 27 #define TC_AVR 28 29 /* This macro is the BFD target name to use when creating the output 30 file. This will normally depend upon the `OBJ_FMT' macro. */ 31 #define TARGET_FORMAT "elf32-avr" 32 33 /* This macro is the BFD architecture to pass to `bfd_set_arch_mach'. */ 34 #define TARGET_ARCH bfd_arch_avr 35 36 /* This macro is the BFD machine number to pass to 37 `bfd_set_arch_mach'. If it is not defined, GAS will use 0. */ 38 #define TARGET_MACH 0 39 40 /* You should define this macro to be non-zero if the target is big 41 endian, and zero if the target is little endian. */ 42 #define TARGET_BYTES_BIG_ENDIAN 0 43 44 /* If you define this macro, GAS will warn about the use of 45 nonstandard escape sequences in a string. */ 46 #define ONLY_STANDARD_ESCAPES 47 48 #define DIFF_EXPR_OK /* .-foo gets turned into PC relative relocs */ 49 50 /* GAS will call this function for any expression that can not be 51 recognized. When the function is called, `input_line_pointer' 52 will point to the start of the expression. */ 53 #define md_operand(x) 54 55 typedef struct 56 { 57 /* Name of the expression modifier allowed with .byte, .word, etc. */ 58 const char *name; 59 60 /* Only allowed with n bytes of data. */ 61 int nbytes; 62 63 /* Associated RELOC. */ 64 bfd_reloc_code_real_type reloc; 65 66 /* Part of the error message. */ 67 const char *error; 68 } exp_mod_data_t; 69 70 extern const exp_mod_data_t exp_mod_data[]; 71 #define TC_PARSE_CONS_RETURN_TYPE const exp_mod_data_t * 72 #define TC_PARSE_CONS_RETURN_NONE exp_mod_data 73 74 /* You may define this macro to parse an expression used in a data 75 allocation pseudo-op such as `.word'. You can use this to 76 recognize relocation directives that may appear in such directives. */ 77 #define TC_PARSE_CONS_EXPRESSION(EXPR,N) avr_parse_cons_expression (EXPR, N) 78 extern const exp_mod_data_t *avr_parse_cons_expression (expressionS *, int); 79 80 /* You may define this macro to generate a fixup for a data 81 allocation pseudo-op. */ 82 #define TC_CONS_FIX_NEW avr_cons_fix_new 83 extern void avr_cons_fix_new (fragS *,int, int, expressionS *, 84 const exp_mod_data_t *); 85 86 /* This should just call either `number_to_chars_bigendian' or 87 `number_to_chars_littleendian', whichever is appropriate. On 88 targets like the MIPS which support options to change the 89 endianness, which function to call is a runtime decision. On 90 other targets, `md_number_to_chars' can be a simple macro. */ 91 #define md_number_to_chars number_to_chars_littleendian 92 93 /* `md_short_jump_size' 94 `md_long_jump_size' 95 `md_create_short_jump' 96 `md_create_long_jump' 97 If `WORKING_DOT_WORD' is defined, GAS will not do broken word 98 processing (*note Broken words::.). Otherwise, you should set 99 `md_short_jump_size' to the size of a short jump (a jump that is 100 just long enough to jump around a long jmp) and 101 `md_long_jump_size' to the size of a long jump (a jump that can go 102 anywhere in the function), You should define 103 `md_create_short_jump' to create a short jump around a long jump, 104 and define `md_create_long_jump' to create a long jump. */ 105 #define WORKING_DOT_WORD 106 107 /* If you define this macro, it means that `tc_gen_reloc' may return 108 multiple relocation entries for a single fixup. In this case, the 109 return value of `tc_gen_reloc' is a pointer to a null terminated 110 array. */ 111 #undef RELOC_EXPANSION_POSSIBLE 112 113 /* No shared lib support, so we don't need to ensure externally 114 visible symbols can be overridden. */ 115 #define EXTERN_FORCE_RELOC 0 116 117 /* If defined, this macro allows control over whether fixups for a 118 given section will be processed when the linkrelax variable is 119 set. Define it to zero and handle things in md_apply_fix instead.*/ 120 #define TC_LINKRELAX_FIXUP(SEG) 0 121 122 /* If this macro returns non-zero, it guarantees that a relocation will be emitted 123 even when the value can be resolved locally. Do that if linkrelax is turned on */ 124 #define TC_FORCE_RELOCATION(fix) avr_force_relocation (fix) 125 #define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \ 126 (! SEG_NORMAL (seg) || avr_force_relocation (fix)) 127 extern int avr_force_relocation (struct fix *); 128 129 /* Values passed to md_apply_fix don't include the symbol value. */ 130 #define MD_APPLY_SYM_VALUE(FIX) 0 131 132 /* If you define this macro, it should return the offset between the 133 address of a PC relative fixup and the position from which the PC 134 relative adjustment should be made. On many processors, the base 135 of a PC relative instruction is the next instruction, so this 136 macro would return the length of an instruction. */ 137 #define MD_PCREL_FROM_SECTION(FIX, SEC) md_pcrel_from_section (FIX, SEC) 138 extern long md_pcrel_from_section (struct fix *, segT); 139 140 /* The number of bytes to put into a word in a listing. This affects 141 the way the bytes are clumped together in the listing. For 142 example, a value of 2 might print `1234 5678' where a value of 1 143 would print `12 34 56 78'. The default value is 4. */ 144 #define LISTING_WORD_SIZE 2 145 146 /* AVR port uses `$' as a logical line separator. */ 147 #define LEX_DOLLAR 0 148 149 /* An `.lcomm' directive with no explicit alignment parameter will 150 use this macro to set P2VAR to the alignment that a request for 151 SIZE bytes will have. The alignment is expressed as a power of 152 two. If no alignment should take place, the macro definition 153 should do nothing. Some targets define a `.bss' directive that is 154 also affected by this macro. The default definition will set 155 P2VAR to the truncated power of two of sizes up to eight bytes. */ 156 #define TC_IMPLICIT_LCOMM_ALIGNMENT(SIZE, P2VAR) (P2VAR) = 0 157 158 /* We don't want gas to fixup the following program memory related relocations. 159 We will need them in case that we want to do linker relaxation. 160 We could in principle keep these fixups in gas when not relaxing. 161 However, there is no serious performance penalty when making the linker 162 make the fixup work. Check also that fx_addsy is not NULL, in order to make 163 sure that the fixup refers to some sort of label. */ 164 #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \ 165 if ( (FIXP->fx_r_type == BFD_RELOC_AVR_7_PCREL \ 166 || FIXP->fx_r_type == BFD_RELOC_AVR_13_PCREL \ 167 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM \ 168 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_GS \ 169 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM \ 170 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_GS \ 171 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM \ 172 || FIXP->fx_r_type == BFD_RELOC_AVR_LO8_LDI_PM_NEG \ 173 || FIXP->fx_r_type == BFD_RELOC_AVR_HI8_LDI_PM_NEG \ 174 || FIXP->fx_r_type == BFD_RELOC_AVR_HH8_LDI_PM_NEG \ 175 || FIXP->fx_r_type == BFD_RELOC_AVR_8_LO \ 176 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HI \ 177 || FIXP->fx_r_type == BFD_RELOC_AVR_8_HLO \ 178 || FIXP->fx_r_type == BFD_RELOC_AVR_16_PM) \ 179 && FIXP->fx_addsy != NULL \ 180 && FIXP->fx_subsy == NULL) \ 181 { \ 182 symbol_mark_used_in_reloc (FIXP->fx_addsy); \ 183 goto SKIP; \ 184 } 185 186 /* This macro is evaluated for any fixup with a fx_subsy that 187 fixup_segment cannot reduce to a number. If the macro returns 188 false an error will be reported. */ 189 #define TC_VALIDATE_FIX_SUB(fix, seg) avr_validate_fix_sub (fix) 190 extern int avr_validate_fix_sub (struct fix *); 191 192 /* This target is buggy, and sets fix size too large. */ 193 #define TC_FX_SIZE_SLACK(FIX) 2 194 195 /* AVR instructions are 2 or 4 bytes long. */ 196 #define DWARF2_LINE_MIN_INSN_LENGTH 2 197 198 /* 32 bits pseudo-addresses are used on AVR. */ 199 #define DWARF2_ADDR_SIZE(bfd) 4 200 201 /* Enable cfi directives. */ 202 #define TARGET_USE_CFIPOP 1 203 204 /* The stack grows down, and is only byte aligned. */ 205 #define DWARF2_CIE_DATA_ALIGNMENT -1 206 207 /* Define the column that represents the PC. */ 208 #define DWARF2_DEFAULT_RETURN_COLUMN 36 209 210 /* Define a hook to setup initial CFI state. */ 211 extern void tc_cfi_frame_initial_instructions (void); 212 #define tc_cfi_frame_initial_instructions tc_cfi_frame_initial_instructions 213 214 /* The difference between same-section symbols may be affected by linker 215 relaxation, so do not resolve such expressions in the assembler. */ 216 #define md_allow_local_subtract(l,r,s) avr_allow_local_subtract (l, r, s) 217 extern bfd_boolean avr_allow_local_subtract (expressionS *, expressionS *, segT); 218 219 #define elf_tc_final_processing avr_elf_final_processing 220 extern void avr_elf_final_processing (void); 221 222 #define md_post_relax_hook avr_post_relax_hook () 223 extern void avr_post_relax_hook (void); 224 225 #define HANDLE_ALIGN(fragP) avr_handle_align (fragP) 226 extern void avr_handle_align (fragS *fragP); 227 228 struct avr_frag_data 229 { 230 unsigned is_org : 1; 231 unsigned is_align : 1; 232 unsigned has_fill : 1; 233 234 char fill; 235 offsetT alignment; 236 }; 237 #define TC_FRAG_TYPE struct avr_frag_data 238
